Forgotten remains in LoopIterator.h

Hi @llvm,

I had to comment out

template<> struct DFSetTraits<LoopBlocksTraversal> {
   static void finishPostorder(BasicBlock *BB, LoopBlocksTraversal& LBT)
   {
     LBT.finishPostorder(BB);
   }
};

in LoopIterator.h in order to get the latest llvm compiling. I guess it is going to be removed anyway.

Best regards
Olaf Krzikalla